package cn.itedus.lottery.domain.strategy.service.draw;

import cn.itedus.lottery.common.Constants;
import cn.itedus.lottery.domain.strategy.model.aggregates.StrategyRich;
import cn.itedus.lottery.domain.strategy.model.req.DrawReq;
import cn.itedus.lottery.domain.strategy.model.res.DrawResult;
import cn.itedus.lottery.domain.strategy.model.vo.*;
import cn.itedus.lottery.domain.strategy.service.algorithm.IDrawAlgorithm;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.List;

/**
 * 抽奖类定义模板方法流程，在抽奖类的doDrawExec方法中，处理整个抽奖流程，
 * 并提供在流程中需要使用到的抽象方法，由DrawExecImpl服务逻辑中的具体实现
 */
public abstract class AbstractDrawBase extends DrawStrategySupport implements IDrawExec {

    private Logger logger = LoggerFactory.getLogger(AbstractDrawBase.class);

    @Override
    public DrawResult doDrawExec(DrawReq req) {
        // 1.获取抽奖策略
        StrategyRich strategyRich = super.queryStrategyRich(req.getStrategyId());
        StrategyBriefVO strategy = strategyRich.getStrategy();

        // 2.校验抽奖策略是否已经初始化到内存
        this.checkAndInitRateDate(req.getStrategyId(), strategy.getStrategyMode(), strategyRich.getStrategyDetailList());

        // 3.获取不在抽奖范围内的列表，包括：奖品库存为空，风控策略、临时调整等
        List<String> excludeAwardIds = this.queryExcludeAwardIds(req.getStrategyId());

        // 4.执行抽奖算法
        String awardId = this.drawAlgorithm(req.getStrategyId(), drawAlgorithmGroup.get(strategy.getStrategyMode()), excludeAwardIds);

        // 5.包装中奖结果
        return buildDrawResult(req.getuId(), req.getStrategyId(), awardId, strategy);
    }

    /**
     * 校验抽奖策略是否已经初始化到内存
     * @param strategyId 抽奖策略ID
     * @param strategyMode 抽奖策略模式
     * @param strategyDetailList 抽奖策略详情
     */
    protected void checkAndInitRateDate(Long strategyId, Integer strategyMode, List<StrategyDetailBriefVO> strategyDetailList) {
        // 1.根据抽奖策略模式，获取对应的抽奖服务
        IDrawAlgorithm drawAlgorithm = drawAlgorithmGroup.get(strategyMode);

        // 2.判断已处理过的数据
        if (drawAlgorithm.isExist(strategyId)) {
            return;
        }
        // 3.解析并初始化中奖概率数据到散列表
        List<AwardRateInfo> awardRateInfoList = new ArrayList<>(strategyDetailList.size());
        for (StrategyDetailBriefVO strategyDetail : strategyDetailList) {
            awardRateInfoList.add(new AwardRateInfo(strategyDetail.getAwardId(), strategyDetail.getAwardRate()));
        }
        drawAlgorithm.initRateTuple(strategyId, strategyMode, awardRateInfoList);
    }


    /**
     * 获取不在抽奖范围的列表，包括：奖品库存为空、风控策略、临时调整等，这类数据是含有业务逻辑的，所以需要由具体的实现方决定
     *
     * @param strategyId 策略ID
     * @return 排除的奖品ID集合
     */
    protected abstract List<String> queryExcludeAwardIds(Long strategyId);


    /**
     * 执行抽奖算法
     * @param strategyId 策略ID
     * @param iDrawAlgorithm 抽奖算法模型
     * @param excludeAwardIds 排除的抽奖ID集合
     * @return 中奖结果ID
     */
    protected abstract String drawAlgorithm(Long strategyId, IDrawAlgorithm iDrawAlgorithm, List<String> excludeAwardIds);

    /**
     * 包装抽奖结果
     * @param uId 用户ID
     * @param strategyId 策略ID
     * @param awardId 奖品ID, null 情况：并发抽奖情况下，库存临界值1 -> 0 ,会有用户中奖结果为null
     * @param strategy 策略简要信息
     * @return 中奖结果
     */
    private DrawResult buildDrawResult(String uId, Long strategyId, String awardId, StrategyBriefVO strategy) {
        if (null == awardId) {
            logger.info("执行策略抽奖完成【未中奖】，用户：{}策略ID：{}", uId, strategyId);
            return new DrawResult(uId, strategyId, Constants.DrawState.FAIL.getCode());
        }
        AwardBriefVO awardBriefVO = super.queryAwardInfoByAwardId(awardId);
        DrawAwardInfo drawAwardInfo = new DrawAwardInfo(awardBriefVO.getAwardId(), awardBriefVO.getAwardType(), awardBriefVO.getAwardName(), awardBriefVO.getAwardContent());
        drawAwardInfo.setStrategyMode(strategy.getStrategyMode());
        drawAwardInfo.setGrantType(strategy.getGrantType());
        drawAwardInfo.setGrantDate(strategy.getGrantDate());
        logger.info("执行策略抽奖完成【已中奖】，用户：{}，策略ID:{}，奖品ID：{}，奖品名称：{}", uId, strategyId, awardBriefVO.getAwardId(), awardBriefVO.getAwardName());
        return new DrawResult(uId, strategyId, Constants.DrawState.SUCCESS.getCode(), drawAwardInfo);
    }
}
